Adjustable cutterhead



Jan. 4, 1944. H. M. ROBINSON ADJUSTABLE CUTTER HEAD Filed March 13, 1941 INVENTOR HERSCHEL M. ROBINSON J xm ATTORNEY v Patented Jan. 4, 1944 ADJUSTABLE CUTTERHEAD Herschel M. Robinson, New Albany, Ind., assignor to The Mengel Company, Louisville, Ky., a corporation of New Jersey Application March 13, 1941, Serial N0. 383,086

4 Claims.

This invention relates to a rotating cutter head for working wood and has special application for forming and sizing the ends of chair-rungs.

The main object of this invention is to provide a cutter head that can be expeditiously adjusted for forming the ends of chair-rungs or the like to a desired diameter and length and then change the position of the adjustable cutter blades for effecting other diameters and/or lengths over a wide range of sizes by the use of a wrench and screw driver and Without removing the cutter head from the lathe or other machine on which it is mounted for use and without disturbing the cutter blades from their mountings.

Another object of this invention is to provide a cutter head, having a wide range of adjustment, of simple construction and capable of long service without repairs or service beyond occasional sharpening of the cutting edges of the knives.

A further object of this invention resides in the design wherein the production of the cutter head is effected at low cost of labor and material.

Referring to the drawing:

Figure 1 is a plan view of the complete cutter head.

Figure 2 is a side elevation of Figure 1, a portion of the cutter blade in the foreground is cut away to display the other cutter in full lines.

Figure 3 is a side elevation of Figure l, disposed at 90 from Figure 2, the center cutter, cutter blades and arms for mounting the latter being omitted.

Figure 4 is a sectional elevation of cutter bearing arm l9, along line 4, 4 of Figure 1 to show a cutter blade, mounting and adjustment means for the blade.

Figure 5 is a fragment of Figure 1 in elevation to show the center cutter, mounting and means for adjusting the cutter.

Figure 6 is an elevation of the end of a chairrung in finished form.

Numeral l0 designates the main body or frame of the head from the back face of which projects a collar II for mounting on a lathe, and from the front face of which body project segmental pads I2, l3. These projections are preferably integral with the body. The pads are fashioned with recesses HA, ISA and shaft bearing I2B, 13B for housing rotating worms 15, I4 on shafts I6,

shaft by pins and the shafts are provided with heads andslots therein for the reception of a screw driver bit.

On the front face 10A of the body H) are pivotally mounted cutter carrying arms I8, H] by means of stud-shafts 20, 2| fixed in and projecting vertically from said face. Also similarly projecting from said face are screw-studs 22, 23, 24, 25, these extend through arcuate slots 22A, 23A, 24A, 25A, respectively, in said arms. Operatively associated with these screw-studs and arms are nuts for securing the arms at a selected location.

A segment of a gear is formed in the arcuate rim or face of each cutter bearing arm and disposed for engagement with a Worm operatively associated therewith. By means of the worms and gears the cutter bearing arms can be adjusted over a wide range of travel and for setting the cutting edges into diametrical relation and for cutting the rungs to desired diameters. These cutter bearing arms I8, l9 and the cutter blades 26, 21 slidably mounted thereon are duplicates, hence the further detailed description thereof will be confined to one set. Extending vertically from arm I9 and integral therewith is cutter perch [9A, and on one vertical face thereof is mounted cutter 21 by means of slot [93, tongue 21a disposed therein and secured by screws 28, as shown in sectional elevation in Figure 4. The cutter is formed with elongated slots 213 for receiving said screws. The screws extend through holes in perch [9A and serve to secure the cutter at a selected location after longitudinal adjustment permitted by means of said slots. This adjustment is provided for locating the cutting edges diametrically also to compensate for cutter changes resulting from Wear and/ or grinding. In arm I9 is bearing 2lA for receiving pin 2|, adverted to above.

End cutter 3B is centrally disposed of body 10 and is longitudinally adjustable by means of screw 3!. Key 32' jointly disposed in body [0 and the shank of the cutter holds said cutter against rotation.

In operation, a chair rung 29, shaped except for the end sections, is secured in a chuck, or other feeding device and advanced toward the rotating cutter head, whereupon the end section is sized as the rung is advanced and engaged by the cutting edges of the blades 26, 21, concurrently with removing the material at the end of the cut, the end edge of the rung engages cutter 30 for effecting chamber or bevel 30A. The rung is then withdrawn from the cutters, reversed in the chuck and the same operation effected on the other end, thereby completing the operation.

The foregoing enumeration of fundamental principles and effects produced by the apparatus selected for disclosing this invention is a preferred embodiment of my invention.

I claim:

1. A cutter head comprising; a cylindrical body having a pair of stub-shafts diametrically spaced and projecting perpendicularly in parallel relation from one flat face thereof, and a pair of worm housings diametrically spaced and projecting from said face; a Worm rotatably mounted in each housing; a substantially flat arm pivotally mounted on each of said shafts with the bottom surface thereof engaging the said face of the head; a cutter blade adjustably mounted on each arm; an integral gear projecting from the lateral face of each arm and meshed with one of said worms; means for rotating each of said worms, one at a time, for effecting adjustment of the arm operatively associated therewith; and means for locking said arms to said head after said adjustment has been effected.

2. A cutter head comprising; a solid body hav ing a pair of stub-shafts diametrically spaced and projecting perpendicularly in parallel relation from a face thereof; a pair of worm housings diametrically spaced and formed in said face; a Worm rotatably mounted in each housing; an arm pivotally mounted on each of said shafts; a cutter blade adjustably mounted on each arm; an integral gear projecting from the rim of each arm and meshed with one of said worms, and means for rotating each of said worms for effecting adjustment of the arm with which a given worm is operatively associated.

3. A cutter head for finishing the end portion of a chair-rung into cylindrical form and concurrently beveling the end edge thereof, comprising; a body having a stub-shaft radially disposed and projecting perpendicularly from a face thereof; an arm pivotally mounted on said shaft; a blade having a cutting edge projecting from said arm; means for effecting adjustment of said arm, means for locking said arm to said body after effecting said adjustment; and an end cutter centrally disposed of said body for beveling the end edge of said chair-rung and means for axially adjusting said end cutter and in terms of the said cutting edge.

4. A cutter head comprising; a flat body having a stub-shaft spaced radially from the axis of said head and projecting perpendicularly from one face thereof; a worm housing spaced radially of the rotating axis of the head and projecting parallel to said axis from said face; a recess in an edge of said housing facing said stub-shaft; a worm rotatably mounted in said housing and having a portion, of its thread projecting from said recess; a substantially flat arm pivotally mounted on said stub-shaft with the bottom surface thereof engaging the said face of the head in Sliding relation thereto and having an edge portion adjacent said recess in the edge of the housing; a cutter blade adjustably mounted on said arm; an integral gear on said edge portion of said arm and meshed with said worm; rotation of said Worm effecting adjustment of the arm operatively associated therewith; and means diametrically disposed on both sides of said stub-shaft for locking said arm to said head after adjustment thereof.

HERSCHEL M. ROBINSON. 

